CPT Penetrometers


Three different CPT penetrometers are offered by A.P. van den Berg for the performance of Cone Penetration Tests. Each penetrometer can be extended with options for extra comfort, for example with the automatic CPT rod screw or wireless data transfer.

COSON-ST, fast & hands-free CPT machine

By integrating the patented SingleTwist™-system into a CPT cabin with the COSON pushing system, a fast CPT machine for hands-free operations is created. Several folder sizes are available holding up to 70 m of CPT string. The COSON-ST does not require any manpower during the push/pull cycle of a CPT. The operator only has to provide the start/stop signals. The pushing process is continuous, generally resulting in 20% shorter pushing times, increased penetration depths and no dissipation effects associated with a single clamp’s discontinuous pushing process. The pulling process with the COSON-ST is more than 15% faster than with a single clamp system, so the total CPT cycle time is reduced considerably.

COSON, continuous CPT penetrometer

Faster and more comfortable CPT operations with A.P. van den Berg’s Continuous CPT Penetrometer (COSON) in combination with the automatic CPT rod screw.
 
The COSON is a CPT system with a continuous downward movement of the CPT rods. The penetrometer consists of two sets of cylinders, both fitted with a hydraulic clamp. When the upper clamp has finished its downward stroke, the lower clamp takes over the movement at the same speed. This results in a time saving of about 7 s/m, because in a single clamp system the downward movement is interrupted to move the clamp back to the upper position.
 
The CPT operator only needs to add and screw new CPT rods. However, this can be realized easier and faster with the automatic CPT rod screw. All the operator has to do is place the rod in the CPT rod screw. A sensor will activate the automatic screw to take over the CPT rod and screw it onto the previous one. During pulling the procedure is reversed.
 
The COSON works in conjunction with both electrical and wireless CPT. 

HYSON, static CPT penetrometer

A.P. van den Berg’s unique HYSON penetrometer is an H-form twin hydraulic cylinder set. The low position of the upperbeam provides a convenient working height. The piston rods are fixed to the truck frame: the cylinders move. These safety and efficiency features are found only on the HYSON. The piston rods are hardened, making them practically maintenance free. The penetrometer is electronically operated by HMI, installed in the control console alongside of the penetrometer. The console also contains vehicle engine controls, and the CPT data acquisition system.